I met this guy and i fell for him right away. we've been hanging out for almost a year(7 months) and we're good friends. lately he's been doing things that make me confused.

this might be a little long, but try to answer it.

OKAY. for the past couple of months hes been doing things like:
-sitting close to me
-holding my arm on his lap
-always touching my hands or my legs
-talking to me a lot more
-making fun of me(in a joking way), and if i looked pissed off or upset about it he'd say sorry.
-i always catch him looking at me through the corner of my eye and when i look at him, he looks away.
-he flirts with me when no ones paying attention to what me and him are doing
-he blew in my ear one day(which means he likes me from what i learned from looking it up)
-he always looks at me in the hallways at school

but i see him do the same to other girls, and he's always hanging out with a really pretty girl right next to him.

is he using me for something? should i stay away from him? how do i get over him if he is just doing it for fun?

PLEASE ANSWER